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LeetCode Question Difficulty Distribution

ID Question Diff Freq Data Structur 1Two Sum25array

1Two Sum25set

8String to Integer (atoi)25 string

153Sum35 array

20Valid Parentheses25 string

21Merge Two Sorted Lists25 linked list

28Implement strStr()45 string

50Pow(x, n)35

56Merge Intervals45 array

56Merge Intervals45linked list

56Merge Intervals45red-black tree 57Insert Interval45 array

57Insert Interval45linked list

57Insert Interval45red-black tree 65Valid Number25 string

70Climbing Stairs25

73Set Matrix Zeroes35 array

88Merge Sorted Array25 array

98Validate Binary Search Tree35 tree

125Valid Palindrome25 string

127Word Ladder35 graph

127Word Ladder35 graph 2Add Two Numbers34 linked list

2Add Two Numbers34 linked list

12Integer to Roman34

13Roman to Integer24

22Generate Parentheses34 string

23Merge k Sorted Lists34 linked list

23Merge k Sorted Lists34heap

23Merge k Sorted Lists34

24Swap Nodes in Pairs24 linked list

27Remove Element14 array

46Permutations34 array

49Anagrams34 string

49Anagrams34hashtable

67Add Binary24 string

69Sqrt(x)44

77Combinations34

78Subsets34 array

79Word Search34 array

91Decode Ways34 string

102Binary Tree Level Order Traversal34 tree

129Sum Root to Leaf Numbers24 tree

131Palindrome Partitioning34 string

4Median of Two Sorted Arrays53array

7Reverse Integer23

10Regular Expression Matching53 string

17Letter Combinations of a Phone Number33 string

19Remove Nth Node From End of List23 linked list 26Remove Duplicates from Sorted Array13 array

29Divide Two Integers43

33Search in Rotated Sorted Array43 array

34Search for a Range43 array

39Combination Sum33 array

43Multiply Strings43 string

44Wildcard Matching53 string

51N-Queens43 array

52N-Queens II43 array

53Maximum Subarray33 array

62Unique Paths23 array

63Unique Paths II33 array

64Minimum Path Sum33 array

72Edit Distance43 string

74Search a 2D Matrix33 array

81Search in Rotated Sorted Array II53 array

82Remove Duplicates from Sorted List II33 linked list 82Remove Duplicates from Sorted List II33 linked list 83Remove Duplicates from Sorted List13 linked list 86Partition List33 linked list 93Restore IP Addresses33 string

94Binary Tree Inorder Traversal43 tree

94Binary Tree Inorder Traversal43hashtable

94Binary Tree Inorder Traversal43

103Binary Tree Zigzag Level Order Traversa43 queue

103Binary Tree Zigzag Level Order Traversa43tree

105Construct Binary Tree from Preorder and33 array

105Construct Binary Tree from Preorder and33tree

106Construct Binary Tree from Inorder and 33 array

106Construct Binary Tree from Inorder and 33tree

108Convert Sorted Array to Binary Search T23 tree

109Convert Sorted List to Binary Search Tr43 linked list 109Convert Sorted List to Binary Search Tr43 linked list 112Path Sum13 tree

114Flatten Binary Tree to Linked List33 tree

116Populating Next Right Pointers in Each 33 tree

128Longest Consecutive Sequence43 array

130Surrounded Regions43 array

132Palindrome Partitioning II43 string

3Longest Substring Without Repeating Cha32 string

5Longest Palindromic Substring42 string

9Palindrome Number22

11Container With Most Water32 array

184Sum32 array

25Reverse Nodes in k-Group42 linked list 25Reverse Nodes in k-Group42 linked list 31Next Permutation52 array

35Search Insert Position22 array

36Valid Sudoku22 array

37Sudoku Solver42 array

38Count and Say22 string

40Combination Sum II42 array

41First Missing Positive52 array

42Trapping Rain Water42 array

45Jump Game II42 array

47Permutations II42 array

48Rotate Image42 array

54Spiral Matrix42 array

55Jump Game32 array

59Spiral Matrix II32 array

61Rotate List32 linked list 66Plus One12 array

68Text Justification42 string

75Sort Colors42 array

76Minimum Window Substring42 string

80Remove Duplicates from Sorted Array II22 array

84Largest Rectangle in Histogram52 array

87Scramble String52 string

89Gray Code42

90Subsets II42 array

92Reverse Linked List II32 linked list 97Interleaving String52 string

97Interleaving String52 string

99Recover Binary Search Tree42 tree

101Symmetric Tree12 tree

110Balanced Binary Tree12 tree

113Path Sum II22 tree

115Distinct Subsequences42 string

117Populating Next Right Pointers in Each 42 tree

124Binary Tree Maximum Path Sum42 tree

6ZigZag Conversion31 string

14Longest Common Prefix21 string

163Sum Closest31 array

30Substring with Concatenation of All Wor31 string

32Longest Valid Parentheses41 string

58Length of Last Word11 string

60Permutation Sequence51

71Simplify Path31 string

85Maximal Rectangle51 array

95Unique Binary Search Trees II41 tree

96Unique Binary Search Trees31 tree

100Same Tree11 tree

104Maximum Depth of Binary Tree11 tree

107Binary Tree Level Order Traversal II31 tree

111Minimum Depth of Binary Tree11 tree

118Pascal's Triangle21 array

119Pascal's Triangle II21 array

120Triangle31 array

121Best Time to Buy and Sell Stock21 array

122Best Time to Buy and Sell Stock II31 array

123Best Time to Buy and Sell Stock III41 array

126Word Ladder II11

Algorithms

sort

Two Pointers

Math

Two Pointers

Stack

sort

Two Pointers

merge

Two Pointers

KMP

rolling hash

Binary Search

Math

sort

merge

ed-black tree

sort

merge

ed-black tree

Math

Two Pointers

merge

DFS

Two Pointers

BFS

shortest path

Two Pointers

Math

DFS

sort

Two Pointers

merge

linked list

Two Pointers

permutation

Two Pointers

Math

Binary Search

combination

Recursion

combination

DFS

Recursion

BFS

DFS

Binary Search

Math

Recursion

DFS

Two Pointers

Binary Search

Math

Binary Search

combination

Two Pointers

Math

Recursion

greedy

DFS

Binary Search

Recursion

Two Pointers linked list

Two Pointers

DFS

Recursion

morris

Stack

BFS

Stack

DFS

Recursion Two Pointers DFS

Recursion Stack

DFS

BFS

DFS

Two Pointers hashtable

Math

Two Pointers Recursion Two Pointers permutation

DFS

Two Pointers combination sort

Two Pointers Stack

permutation Two Pointers Math

sort

Two Pointers Two Pointers Two Pointers Stack

Recursion DP

combination Recursion combination

Two Pointers Recursion DP

DFS

Two Pointers Two Pointers DP

permutation Math

Stack

DFS

BFS

DFS

greedy

LeetCode Question Difficulty Distribution

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